Hi guys I do like this car but unfortunately I've met so many problem with it. Last year it kept stalling and had strange noise from tank direction. Spent 1k on it for cleaning engine and it was good for a while.

Right now the car still have problem. Last time I just started the car but the rpm is only about 600 (nearly stall). I gave a little gas it jumped to 1500 immediately. What is more is the car keeps shaking when I'm cruising about 10-25 mph. It feels like misfire but no code.

It could be several things. My first guess would be the coil packs. They're known to go bad prematurely. Next check your intake piping as you may be sucking in unmetered air. Are you using a VCDS cable to check for your diagnosis?

It could be several things. My first guess would be the coil packs. They're known to go bad prematurely. Next check your intake piping as you may be sucking in unmetered air. Are you using a VCDS cable to check for your diagnosis?

Yeah probably. I'll check the coil packs. I don't have that cable... All I can do is do some maintenance myself.

No mods at all. might need to consider upgrade some parts.
And...how to check those parts. It feels like no where to start.

If it's stock, the green o-ring inside the top leaks quite often, check the rubber that goes to the throttle body and make sure it's not cracked, loose, and that the plastic pipe that it's connected to dfoesnt have a crack.

These cars are full of plastic parts, and eliminating the m imo is your best option, if you want a long life on the car.

You said they cleaned the engine right? It could be possible they didn't tighten something up enough, or left it out completely. Open the hood, listen for hissing sounds, get a soap and water bottle and start spraying around and if bubbles form, you have your leak. If the engine surges, or does anything else while you're spraying, you have a leak there. Listen to the exhaustfrom under the car (add plenty of support, not just the jack) if you have hissing there, it's an exhaust leak.

I don't think it would be the exhaust personally, but you never know. You have aa lot of miles on your stock coil packs, so they could definitely be an issue as was already mentioned. A set of red tops is 80 ish dollars iirc. They are very reliable, and a good investment. The pcv valve is also a common area of failure, it's 80-100 to replace and only about a 15 minute job DIY.

On another note, you might want to look at you DV and make sure you don't have the rev G version, which tears and is junk. That is also the cause of boost leaks. It's worth replacing as well if that's the case.

If it's stock, the green o-ring inside the top leaks quite often, check the rubber that goes to the throttle body and make sure it's not cracked, loose, and that the plastic pipe that it's connected to dfoesnt have a crack.

These cars are full of plastic parts, and eliminating the m imo is your best option, if you want a long life on the car.

You said they cleaned the engine right? It could be possible they didn't tighten something up enough, or left it out completely. Open the hood, listen for hissing sounds, get a soap and water bottle and start spraying around and if bubbles form, you have your leak. If the engine surges, or does anything else while you're spraying, you have a leak there. Listen to the exhaustfrom under the car (add plenty of support, not just the jack) if you have hissing there, it's an exhaust leak.

I don't think it would be the exhaust personally, but you never know. You have aa lot of miles on your stock coil packs, so they could definitely be an issue as was already mentioned. A set of red tops is 80 ish dollars iirc. They are very reliable, and a good investment. The pcv valve is also a common area of failure, it's 80-100 to replace and only about a 15 minute job DIY.

On another note, you might want to look at you DV and make sure you don't have the rev G version, which tears and is junk. That is also the cause of boost leaks. It's worth replacing as well if that's the case.

Installed 4 new redtop coil packs and 4 new spark plugs. Found very little solid oil on my old coils and spark plugs. What is the reason for this? I'd say it's better but might still have misfire(vibration) in cold start.

Ordered a Go Fast Bits T9351 dv. Try to place this and see what happens.

Found a post :

"
I have a 2011 GTI with 92k miles on it. I noticed the car idled rough on warmup only (fast idle) but I was not getting any CEL. I installed the APR Stage 2 tune (with 4 programs) and that's when I started getting the CEL on warmup only. The codes weren't consistent regarding which cylinders the misfires were occurring. After warmup if I cleared the codes they would not again reappear while I drive the car (only at the next time I warmed the car up).

I replaced the plugs and coils and the issue did not resolve (which I expected due to the misfires affecting all cylinders) . Also, the codes appeared irregardless of which program I ran (Stock, 91, 93).

I just cleaned the carbon from my valves and now everything is perfect. The only other variable is that in the process of cleaning my valves I also replaced my intake manifold (since replacements are readily available and not too expensive)....so it was either the carbon build up or the runner motor in the intake which was the issue.

"

It seems we have same issue here but I got my engine cleaned 6 months ago. And he cleaned the valves. What are these valves?